+++ /dev/null
-package org.apache.lucene.queryParser.standard.processors;
-
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import java.util.List;
-
-import org.apache.lucene.queryParser.core.QueryNodeException;
-import org.apache.lucene.queryParser.core.nodes.FieldQueryNode;
-import org.apache.lucene.queryParser.core.nodes.FuzzyQueryNode;
-import org.apache.lucene.queryParser.core.nodes.ParametricQueryNode;
-import org.apache.lucene.queryParser.core.nodes.QueryNode;
-import org.apache.lucene.queryParser.core.nodes.QuotedFieldQueryNode;
-import org.apache.lucene.queryParser.core.processors.QueryNodeProcessorImpl;
-import org.apache.lucene.queryParser.core.util.UnescapedCharSequence;
-import org.apache.lucene.queryParser.standard.nodes.PrefixWildcardQueryNode;
-import org.apache.lucene.queryParser.standard.nodes.WildcardQueryNode;
-import org.apache.lucene.queryParser.standard.parser.StandardSyntaxParser;
-import org.apache.lucene.search.PrefixQuery;
-
-/**
- * The {@link StandardSyntaxParser} creates {@link PrefixWildcardQueryNode} nodes which
- * have values containing the prefixed wildcard. However, Lucene
- * {@link PrefixQuery} cannot contain the prefixed wildcard. So, this processor
- * basically removed the prefixed wildcard from the
- * {@link PrefixWildcardQueryNode} value. <br/>
- *
- * @see PrefixQuery
- * @see PrefixWildcardQueryNode
- */
-public class WildcardQueryNodeProcessor extends QueryNodeProcessorImpl {
-
- public WildcardQueryNodeProcessor() {
- // empty constructor
- }
-
- @Override
- protected QueryNode postProcessNode(QueryNode node) throws QueryNodeException {
-
- // the old Lucene Parser ignores FuzzyQueryNode that are also PrefixWildcardQueryNode or WildcardQueryNode
- // we do the same here, also ignore empty terms
- if (node instanceof FieldQueryNode || node instanceof FuzzyQueryNode) {
- FieldQueryNode fqn = (FieldQueryNode) node;
- CharSequence text = fqn.getText();
-
- // do not process wildcards for ParametricQueryNode and
- // QuotedFieldQueryNode to reproduce the old parser behavior
- if (fqn instanceof ParametricQueryNode
- || fqn instanceof QuotedFieldQueryNode
- || text.length() <= 0){
- // Ignore empty terms
- return node;
- }
-
- // Code below simulates the old lucene parser behavior for wildcards
-
- if (isPrefixWildcard(text)) {
- PrefixWildcardQueryNode prefixWildcardQN = new PrefixWildcardQueryNode(fqn);
- return prefixWildcardQN;
-
- } else if (isWildcard(text)){
- WildcardQueryNode wildcardQN = new WildcardQueryNode(fqn);
- return wildcardQN;
- }
-
- }
-
- return node;
-
- }
-
- private boolean isWildcard(CharSequence text) {
- if (text ==null || text.length() <= 0) return false;
-
- // If a un-escaped '*' or '?' if found return true
- // start at the end since it's more common to put wildcards at the end
- for(int i=text.length()-1; i>=0; i--){
- if ((text.charAt(i) == '*' || text.charAt(i) == '?') && !UnescapedCharSequence.wasEscaped(text, i)){
- return true;
- }
- }
-
- return false;
- }
-
- private boolean isPrefixWildcard(CharSequence text) {
- if (text == null || text.length() <= 0 || !isWildcard(text)) return false;
-
- // Validate last character is a '*' and was not escaped
- // If single '*' is is a wildcard not prefix to simulate old queryparser
- if (text.charAt(text.length()-1) != '*') return false;
- if (UnescapedCharSequence.wasEscaped(text, text.length()-1)) return false;
- if (text.length() == 1) return false;
-
- // Only make a prefix if there is only one single star at the end and no '?' or '*' characters
- // If single wildcard return false to mimic old queryparser
- for(int i=0; i<text.length(); i++){
- if (text.charAt(i) == '?') return false;
- if (text.charAt(i) == '*' && !UnescapedCharSequence.wasEscaped(text, i)){
- if (i == text.length()-1)
- return true;
- else
- return false;
- }
- }
-
- return false;
- }
-
- @Override
- protected QueryNode preProcessNode(QueryNode node) throws QueryNodeException {
-
- return node;
-
- }
-
- @Override
- protected List<QueryNode> setChildrenOrder(List<QueryNode> children)
- throws QueryNodeException {
-
- return children;
-
- }
-
-}
fnp / pylucene.git / blobdiff